The 100 metres, or 100 metre dash, is a sprint race in track and field competitions. The shortest common outdoor running distance, it is one of the most popular and prestigious events in the sport of athletics. It has been contested at the Summer Olympics since 1896 for men and since 1928 for women.

On an outdoor 400 metresrunning track, the 100 m is run on the home straight, with the start usually being set on an extension to make it a straight-line race. Runners begin in the starting blocks and the race begins when an official fires the starter's pistol. Sprinters typically reach top speed after somewhere between 50 and 60 m. Their speed then slows towards the finish line.

The 10-second barrier has historically been a barometer of fast men's performances, while the best female sprinters take eleven seconds or less to complete the race. The current men's world record is 9.58 seconds, set by Jamaica's Usain Bolt in 2009, while the women's world record of 10.49 seconds set by American Florence Griffith-Joyner in 1988 remains unbroken.[a]

The 100 m (109.361 yards) emerged from the metrication of the 100 yards (91.44 m), a now defunct distance originally contested in English-speaking countries. The event is largely held outdoors as few indoor facilities have a 100 m straight.

US athletes have won the men's Olympic 100 metres title more times than any other country, 16 out of the 28 times that it has been run. US women have also dominated the event winning 9 out of 21 times.

At high level meets, the time between the gun and first kick against the starting block is measured electronically, via sensors built in the gun and the blocks. A reaction time less than 0.1 s is considered a false start. The 0.2-second interval accounts for the sum of the time it takes for the sound of the starter's pistol to reach the runners' ears, and the time they take to react to it.

For many years a sprinter was disqualified if responsible for two false starts individually. However, this rule allowed some major races to be restarted so many times that the sprinters started to lose focus. The next iteration of the rule, introduced in February 2003, meant that one false start was allowed among the field, but anyone responsible for a subsequent false start was disqualified.

This rule led to some sprinters deliberately false-starting to gain a psychological advantage: an individual with a slower reaction time might false-start, forcing the faster starters to wait and be sure of hearing the gun for the subsequent start, thereby losing some of their advantage. To avoid such abuse and to improve spectator enjoyment, the IAAF implemented a further change in the 2010 season – a false starting athlete now receives immediate disqualification.[6] This proposal was met with objections when first raised in 2005, on the grounds that it would not leave any room for innocent mistakes. Justin Gatlin commented, "Just a flinch or a leg cramp could cost you a year's worth of work."[7] The rule had a dramatic impact at the 2011 World Championships, when current world record holder Usain Bolt was disqualified.[8][9]

Runners normally reach their top speed just past the halfway point of the race and they progressively decelerate in the later stages of the race. Maintaining that top speed for as long as possible is a primary focus of training for the 100 m.[10]Pacing and running tactics do not play a significant role in the 100 m, as success in the event depends more on pure athletic qualities and technique.

The winner, by IAAF Competition Rules, is determined by the first athlete with his or her torso (not including limbs, head, or neck) over the nearer edge of the finish line.[11] There is therefore no requirement for the entire body to cross the finish line. When the placing of the athletes is not obvious, a photo finish is used to distinguish which runner was first to cross the line.

Climatic conditions, in particular air resistance, can affect performances in the 100 m. A strong head wind is very detrimental to performance, while a tail wind can improve performances significantly. For this reason, a maximum tail wind of 2.0 m/s is allowed for a 100 m performance to be considered eligible for records, or "wind legal".

Furthermore, sprint athletes perform a better run at high altitudes because of the thinner air, which provides less air resistance. In theory, the thinner air would also make breathing slightly more difficult (due to the partial pressure of oxygen being lower), but this difference is negligible for sprint distances where all the oxygen needed for the short dash is already in the muscles and bloodstream when the race starts. While there are no limitations on altitude, performances made at altitudes greater than 1000 m above sea level are marked with an "A".[12]

In 2010, French sprinter Christophe Lemaitre became the first Caucasian to break the 10-second barrier, and in 2017, Azerbaijani-born naturalized Turkish Ramil Guliyev followed.[17] In the Prefontaine Classic 2015 Diamond League meet at Eugene, Su Bingtian of China ran a time of 9.99 seconds, becoming the first East Asian athlete to officially break the 10-second barrier. On 22 June 2018, Su improved his time in Madrid with a time of 9.91.[18] On 9 September 2017, Yoshihide Kiryū became the first man from Japan to break the 10-second barrier in the 100 meters, running a 9.98 (+1.8) at an intercollegiate meet in Fukui. In the 2015 Birmingham Grand Prix Diamond League meet, British athlete Adam Gemili, who is of mixed Iranian and Moroccan descent, ran a time of 9.97 seconds on home soil, becoming the first athlete with either North African or Middle Eastern heritage to break the ten-second barrier.[citation needed]

Colin Jackson, an athlete with mixed ethnic background and former world record holder in the 110 metre hurdles,[19] noted that both his parents were talented athletes and suggested that biological inheritance was the greatest influence, rather than any perceived racial factor. Furthermore, successful black role models in track events may reinforce the racial disparity.[20]

Major 100 m races, such as at the Olympic Games, attract much attention, particularly when the world record is thought to be within reach.

The men's world record has been improved upon twelve times since electronic timing became mandatory in 1977.[21] The current men's world record of 9.58 s is held by Usain Bolt of Jamaica, set at the 2009 World Athletics Championships final in Berlin, Germany on 16 August 2009, breaking his own previous world record by 0.11 s.[22] The current women's world record of 10.49 s was set by Florence Griffith-Joyner of the US, at the 1988 United States Olympic Trials in Indianapolis, Indiana, on 16 July 1988[23] breaking Evelyn Ashford's four-year-old world record by .27 seconds. The extraordinary nature of this result and those of several other sprinters in this race raised the possibility of a technical malfunction with the wind gauge which read at 0.0 m/s- a reading which was at complete odds to the windy conditions on the day with high wind speeds being recorded in all other sprints before and after this race as well as the parallel long jump runway at the time of the Griffith-Joyner performance. All scientific studies commissioned by the IAAF and independent organizations since have confirmed there was certainly an illegal tailwind of between 5 m/s - 7 m/s at the time. This should have annulled the legality of this result, although the IAAF has chosen not to take this course of action. The legitimate next best wind legal performance would therefore be Griffith-Joyner's 10.61s performance in the final the next day.[24]

Some records have been marred by prohibited drug use – in particular, the scandal at the 1988 Summer Olympics when the winner, Canadian Ben Johnson was stripped of his medal and world record.

Justin Gatlin ran 9.77 in Doha on 12 May 2006, which was at the time ratified as a world record. However, the record was rescinded in 2007 after he failed a doping test in April 2006. He also ran times of 9.74 (2015), 9.75 (2015), 9.77 (2014), 9.78 (2015), 9.79 (2012), 9.80 (2014, 2015, 2016), 9.82 (2014), 9.83 (2014, 2015), 9.85 (2004, 2013) and 9.86 (2014).

Tim Montgomery's time of 9.78 at Paris on 14 September 2002 was rescinded following his indictment in the BALCO scandal on drug use and drug trafficking charges. The time had stood as the world record until Asafa Powell first ran 9.77.

Ben Johnson ran 9.79 at Seoul on 24 September 1988, but he was disqualified after he tested positive for stanozolol after the race. He subsequently admitted to drug use between 1981 and 1988, and his time of 9.83 at Rome on 30 August 1987 was rescinded.

Any performance with a following wind of more than 2.0 metres per second is not counted for record purposes. Below is a list of the fastest wind-assisted times (9.80 or better). Only times that are superior to legal bests are shown.

Justin Gatlin ran 9.45 (+20 m/s) in 2011 on the Japanese TV show Kasupe! assisted by wind machines blowing at speeds over 25 meters per second.[31]

Florence Griffith-Joyner's world record has been the subject of a controversy due to strong suspicion of a defective anemometer measuring a tailwind lower than actually present;[39] since 1997 the International Athletics Annual of the Association of Track and Field Statisticians has listed this performance as "probably strongly wind assisted, but recognised as a world record".[40] It can be reasonable to assume a wind reading of about +4.7 m/s for Griffith-Joyner's quarter-final. Her legal 10.61 the following day and 10.62 at the 1988 Olympics would still make her the world record holder.[41]

Below is a list of all other legal times equal or superior to 10.77:

As well as the 10.61 (1988) and 10.62 (1988) mentioned in the more facts section, Florence Griffith-Joyner also ran 10.70 (1988).

Any performance with a following wind of more than 2.0 metres per second is not counted for record purposes. Below is a list of the fastest wind-assisted times (10.82 or better). Only times that are superior to legal bests are shown.

Tori Bowie of the USA ran a wind-assisted 10.72 (+3.2) in Eugene, Oregon on 26 June 2015 and 10.74 (+3.1) on July 3 2016.

Tawanna Meadows of the USA ran a wind-assisted 10.72 (+4.5) in Lubbock, Texas on 6 May 2017.

Blessing Okagbare of Nigeria ran a wind-assisted 10.72 (+2.7) in Austin, Texas on 31 March 2018 and 10.75 (+2.2) in Eugene, Oregon on 1 June 2013.

Marshevet Hooker of the USA ran a wind-assisted 10.76 (+3.4) in Eugene, Oregon on 27 June 2008.

Gail Devers of the USA ran a wind-assisted 10.77 (+2.3) in San Jose, California on 28 May 1994.

Ekateríni Thánou of Greece ran a wind-assisted 10.77 (+2.3) in Rethimnó, Greece on 29 May 1999.

Gwen Torrence of the USA ran a wind-assisted 10.78 (+5.0) in Indianapolis, Indiana on 16 July 1988.

Muna Lee of the USA ran a wind-assisted 10.78 (+3.3) in Eugene, Oregon on 26 June 2009.

Marlies Göhr of East Germany ran a wind-assisted 10.79 (+3.3) in Cottbus, East Germany on 16 July 1980.

Kelli White of the USA ran a wind assisted 10.79 (+2.3) in Carson, California on June 1, 2001. This performance was later annulled due to doping offence.

Pam Marshall of the USA ran a wind-assisted 10.80 (+2.9) in Eugene, Oregon on 20 June 1986.

Jenna Prandini of the USA ran a wind-assisted 10.81 (+3.6) in Eugene, Oregon on 2 July 2016.

Silke Gladisch of East Germany ran a wind-assisted 10.82 (+2.2) in Rome, Italy on 30 August 1987.

^ abcIt is widely believed that the anemometer was faulty for the race in which Florence Griffith Joyner set the official world record for the women's 100 m of 10.49 s.[1] A 1995 report commissioned by the IAAF estimated the true wind speed was between +5.0 m/s and +7.0 m/s, rather than the 0.0 recorded.[1] If this time, recorded in the quarter-final of the 1988 U.S. Olympic trials, were excluded, the world record would be 10.61 s, recorded the next day at the same venue by the same athlete in the final.[1][2]

^Linthorne,N.(PHD)(1995)The 100m World Record by Florence Griffith Joyner at the 1988 U.S Olympic Trials. Report for the International Amateur Athletic Federation Department of Physics, University of Western Australia

1.
Sport of athletics
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Athletics is a collection of sporting events that involve competitive running, jumping, throwing, and walking. The most common types of competitions are track and field, road running, cross country running. The results of racing events are decided by finishing position, while the jumps, the simplicity of the competitions, and the lack of a need for expensive equipment, makes athletics one of the most commonly competed sports in the world. Athletics is mostly an individual sport, with the exception of relay races and competitions which combine athletes performances for a team score, organized athletics are traced back to the Ancient Olympic Games from 776 BCE. The rules and format of the events in athletics were defined in Western Europe and North America in the 19th and early 20th century. Most modern top level meetings are conducted by the International Association of Athletics Federations, the athletics meeting forms the backbone of the Summer Olympics. The foremost international athletics meeting is the IAAF World Championships in Athletics, other top level competitions in athletics include the IAAF World Cross Country Championships and the IAAF World Half Marathon Championships. Athletes with a disability compete at the Summer Paralympics and the IPC Athletics World Championships. The word athletics is derived from the Ancient Greek ἀθλητής from ἆθλον or ἆθλος, initially, the term was used to describe athletic contests in general – i. e. sporting competition based primarily on human physical feats. In the 19th century, the term acquired a more narrow definition in Europe. This definition continues to be the most prominent one in the United Kingdom, furthermore, foreign words in many German and Roman languages which are related to the term athletics also have a similar meaning. In much of North America, athletics is synonymous with sports in general, the word athletics is rarely used to refer to the sport of athletics in this region. Track and field is preferred, and is used in the United States and Canada to refer to most athletics events, including racewalking, Athletic contests in running, walking, jumping and throwing are among the oldest of all sports and their roots are prehistoric. Athletics events were depicted in the Ancient Egyptian tombs in Saqqara, with illustrations of running at the Heb Sed festival, the Tailteann Games were an ancient Celtic festival in Ireland, founded around 1800 BCE, and the thirty-day meeting included running and stone-throwing among its sporting events. The original and only event at the first Olympics in 776 BCE was a running event known as the stadion. This later expanded to include throwing and jumping events within the ancient pentathlon, Athletics competitions also took place at other Panhellenic Games, which were founded later around 500 BCE. The Cotswold Olimpick Games, a festival which emerged in 17th century England. Annually, from 1796 to 1798, LOlympiade de la République was held in revolutionary France, the premier event of this competition was a running event, but various ancient Greek disciplines were also on display

2.
2012 Summer Olympics
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It took place in London and to a lesser extent across the United Kingdom from 25 July to 12 August 2012. The first event, the stage in womens football began on 25 July at the Millennium Stadium in Cardiff. 10,768 athletes from 204 National Olympic Committees participated, London is the first and only city thus far to host the modern Olympic Games three times, having previously done so in 1908 and in 1948. Construction for the Games involved considerable redevelopment, with an emphasis on sustainability, the main focus was a new 200-hectare Olympic Park, constructed on a former industrial site at Stratford, East London. The Games also made use of venues that already existed before the bid, the Games received widespread acclaim for their organisation, with the volunteers, the British military and public enthusiasm praised particularly highly. During the Games, Michael Phelps became the most decorated Olympic athlete of all time, saudi Arabia, Qatar, and Brunei entered female athletes for the first time, so that every currently eligible country has sent a female competitor to at least one Olympic Games. Womens boxing was included for the first time, thus the Games became the first at which every sport had female competitors and these were the final Olympic Games under the IOC presidency of Jacques Rogge. The final medal tally was led by the United States, followed by China, several world and Olympic records were set at the games. Furthermore, the focus on sporting legacy and post-games venue sustainability was seen as a blueprint for future Olympics. On 18 May 2004, as a result of a technical evaluation. All five submitted their candidate files by 19 November 2004 and were visited by the IOC inspection team during February, throughout the process, Paris was widely seen as the favourite, particularly as this was its third bid in recent years. London was initially seen as lagging behind Paris by a considerable margin and its position began to improve after the appointment of Lord Coe as the new head of London 2012 on 19 May 2004. In late August 2004, reports predicted a tie between London and Paris, on 6 June 2005, the IOC released its evaluation reports for the five candidate cities. They did not contain any scores or rankings, but the report for Paris was considered the most positive, London was close behind, having closed most of the gap observed by the initial evaluation in 2004. New York and Madrid also received positive evaluations. On 1 July 2005, when asked who would win, Jacques Rogge said, but my gut feeling tells me that it will be very close. Perhaps it will come down to a difference of say ten votes, on 6 July 2005, the final selection was announced at the 117th IOC Session in Singapore. Moscow was the first city to be eliminated, followed by New York, the final two contenders were London and Paris

3.
Jamaica
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Jamaica is an island country situated in the Caribbean Sea, consisting of the third-largest island of the Greater Antilles. The island,10,990 square kilometres in area, lies about 145 kilometres south of Cuba, Jamaica is the fourth-largest island country in the Caribbean, by area. Inhabited by the indigenous Arawak and Taíno peoples, the island came under Spanish rule following the arrival of Christopher Columbus in 1494, Many of the indigenous people died of disease, and the Spanish imported African slaves as labourers. Named Santiago, the island remained a possession of Spain until 1655, under British colonial rule Jamaica became a leading sugar exporter, with its plantation economy highly dependent on slaves imported from Africa. The British fully emancipated all slaves in 1838, and many chose to have subsistence farms rather than to work on plantations. Beginning in the 1840s, the British imported Chinese and Indian indentured labour to work on plantations, the island achieved independence from the United Kingdom on 6 August 1962. With 2.8 million people, Jamaica is the third-most populous Anglophone country in the Americas, Kingston is the countrys capital and largest city, with a population of 937,700. Jamaicans predominately have African ancestry, with significant European, Chinese, Hakka, Indian, due to a high rate of emigration for work since the 1960s, Jamaica has a large diaspora around the world, particularly in Canada, the United Kingdom, and the United States. Jamaica is a Commonwealth realm, with Queen Elizabeth II as its monarch and her appointed representative in the country is the Governor-General of Jamaica, an office held by Sir Patrick Allen since 2009. Andrew Holness has served as the head of government and Prime Minister of Jamaica from March 2016, the indigenous people, the Taíno, called it Xaymaca in Arawakan, meaning the Land of Wood and Water or the Land of Springs. Colloquially Jamaicans refer to their island as the Rock. Slang names such as Jamrock, Jamdown, or briefly Ja, have derived from this, the Arawak and Taíno indigenous people, originating in South America, settled on the island between 4000 and 1000 BC. When Christopher Columbus arrived in 1494, there were more than 200 villages ruled by caciques, the south coast of Jamaica was the most populated, especially around the area now known as Old Harbour. The Taino still inhabited Jamaica when the English took control of the island in 1655, the Jamaican National Heritage Trust is attempting to locate and document any evidence of the Taino/Arawak. Christopher Columbus claimed Jamaica for Spain after landing there in 1494 and his probable landing point was Dry Harbour, now called Discovery Bay, although there is some debate that it might have been St. Anns Bay. St. Anns Bay was named Saint Gloria by Columbus, as the first sighting of the land, the capital was moved to Spanish Town, then called St. Jago de la Vega, around 1534. Spanish Town has the oldest cathedral of the British colonies in the Caribbean, the Spanish were forcibly evicted by the English at Ocho Rios in St. Ann. In 1655, the English, led by Sir William Penn and General Robert Venables, the English continued to import African slaves as labourers

4.
Usain Bolt
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Usain St Leo Bolt, OJ, CD is a Jamaican sprinter. He is the first person to both the 100 metres and 200 metres world records since fully automatic time became mandatory. He also holds the record as a part of the 4 ×100 metres relay. He is the world and Olympic champion in these three events. Due to his dominance and achievements in sprint competition, he is widely considered to be the greatest sprinter of all time. He gained worldwide popularity for his double sprint victory at the 2008 Beijing Olympics in world record times, Bolt is the only sprinter to win Olympic 100 m and 200 m titles at three consecutive olympics, a feat referred to as the triple double. An eleven-time World Champion, he won consecutive World Championship 100 m,200 m and 4 ×100 metres relay medals from 2009 to 2015. He is the most successful athlete of the World Championships and was the first athlete to win three titles in both the 100 m and 200 m at the competition. Bolt improved upon his first 100 m world record of 9.69 with 9.58 seconds in 2009 – the biggest improvement since the start of electronic timing. He has twice broken the 200 metres world record, setting 19.30 in 2008 and 19.19 in 2009 and he has helped Jamaica to three 4 ×100 metres relay world records, with the current record being 36.84 seconds set in 2012. Bolts most successful event is the 200 m, with three Olympic and four World titles, the 2008 Olympics was his international debut over 100 m, he had earlier won numerous 200 m medals and holds the world under-20 and world under-18 records for the event. Bolt has stated that he intends to retire from athletics after the 2017 World Championships. Bolt was born on 21 August 1986 in Sherwood Content, a town in Trelawny, Jamaica, and grew up with parents Wellesley and Jennifer Bolt, his brother Sadiki. As a child, Bolt attended Waldensia Primary, where he first began to show his sprinting potential, by the age of twelve, Bolt had become the schools fastest runner over the 100 metres distance. Upon his entry to William Knibb Memorial High School, Bolt continued to focus on other sports, pablo McNeil, a former Olympic sprint athlete, and Dwayne Jarrett coached Bolt, encouraging him to focus his energy on improving his athletic abilities. The school had a history of success in athletics with past students, Bolt won his first annual high school championships medal in 2001, taking the silver medal in the 200 metres with a time of 22.04 seconds. Performing for Jamaica in his first Caribbean regional event, Bolt clocked a personal best of 48.28 s in the 400 metres in the 2001 CARIFTA Games, the 200 m also yielded a silver, as Bolt finished in 21.81 s. He made his first appearance on the stage at the 2001 IAAF World Youth Championships in Debrecen

5.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci

6.
Sprint (running)
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Sprinting is running over a short distance in a limited period of time. It is used in sports that incorporate running, typically as a way of quickly reaching a target or goal. In athletics and track and field, sprints are races over short distances and they are among the oldest running competitions. The first 13 editions of the Ancient Olympic Games featured only one event—the stadion race, there are three sprinting events which are currently held at the Summer Olympics and outdoor World Championships, the 100 metres,200 metres, and 400 metres. The set position differs depending on the start, body alignment is of key importance in producing the optimal amount of force. Ideally the athlete should begin in a 4-point stance and push off using both legs for maximum force production, athletes remain in the same lane on the running track throughout all sprinting events, with the sole exception of the 400 m indoors. Races up to 100 m are largely focused upon acceleration to a maximum speed. All sprints beyond this distance increasingly incorporate an element of endurance, the 60 metres is a khaled and Rion indoor event and it is an indoor world championship event. Less common events include the 50 metres,55 metres,300 metres, biological factors that determine a sprinters potential include, The 60 metres is normally run indoors, on a straight section of an indoor athletic track. Since races at this distance can last around six or seven seconds, having good reflexes and this is roughly the distance required for a human to reach maximum speed and can be run with one breath. It is popular for training and testing in other sports, the world record in this event is held by American sprinter Maurice Greene with a time of 6.39 seconds. 60-metres is used as a distance by younger athletes when starting sprint racing. Note, Indoor distances are less standardized as many facilities run shorter or occasionally longer distances depending on available space, the 100 metres sprint takes place on one length of the home straight of a standard outdoor 400 m track. Often, the holder in this race is considered the worlds fastest man/woman. The current world record of 9.58 seconds is held by Usain Bolt of Jamaica and was set on 16 August 2009, the womens world record is 10.49 seconds and was set by Florence Griffith-Joyner. World class male sprinters need 41 to 50 strides to cover the whole 100 metres distances, the 200 metres begins on the curve of a standard track, and ends on the home straight. The ability to run a good bend is key at the distance, as a well conditioned runner will typically be able to run 200 m in an average speed higher than their 100 m speed. Usain Bolt, however, ran 200 m in the time of 19.19 sec, an average speed of 10.422 m/s, whereas he ran 100 m in the world-record time of 9.58 sec

7.
Track and field
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Track and field is a sport which includes athletic contests established on the skills of running, jumping, and throwing. The name is derived from the sports venue, a stadium with an oval running track enclosing a grass field where the throwing and jumping events take place. Track and field is categorised under the sport of athletics, which also includes road running, cross country running. The foot racing events, which include sprints, middle- and long-distance events, the jumping and throwing events are won by the athlete who achieves the greatest distance or height. Regular jumping events include long jump, triple jump, high jump and pole vault, while the most common throwing events are shot put, javelin, discus and hammer. There are also combined events or multi events, such as the pentathlon consisting of five events, heptathlon consisting of seven events, in these, athletes participate in a combination of track and field events. Most track and field events are individual sports with a victor, the most prominent team events are relay races. Events are almost exclusively divided by gender, although both the mens and womens competitions are held at the same venue. It is one of the oldest sports, in ancient times, it was an event held in conjunction with festivals and sports meets such as the Ancient Olympic Games in Greece. The ancient Olympic Games began in the year 776 BC, when Koroibos, a cook from the city of Elis, won the stadium race. According to some traditions, this was the only athletic event of the games for the first 13 Olympic festivals. In modern times, the two most prestigious track and field competitions are athletics competition at the Olympic Games and the IAAF World Championships in Athletics. The International Association of Athletics Federations is the governing body. Records are kept of the best performances in specific events, at world and national levels, however, if athletes are deemed to have violated the events rules or regulations, they are disqualified from the competition and their marks are erased. In North America, the track and field may be used to refer to other athletics events, such as the marathon. The sport of track and field has its roots in human prehistory, Track and field-style events are among the oldest of all sporting competitions, as running, jumping and throwing are natural and universal forms of human physical expression. The first recorded examples of organized track and field events at a festival are the Ancient Olympic Games. At the first Games in 776 BC in Olympia, Greece, only one event was contested, Track and field events were also present at the Panhellenic Games in Greece around this period, and they spread to Rome in Italy around 200 BC

8.
Summer Olympic Games
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The Summer Olympic Games or the Games of the Olympiad, first held in 1896, is an international multi-sport event that is hosted by a different city every four years. The most recent Olympics were held in Rio de Janeiro, Brazil, the International Olympic Committee organizes the games and oversees the host citys preparations. In each Olympic event, gold medals are awarded for first place, silver medals are awarded for second place, and bronze medals are awarded for third, the Winter Olympic Games were created due to the success of the Summer Olympics. The Olympics have increased in scope from a 42-event competition with fewer than 250 male competitors from 14 nations in 1896 to 302 events with 10,768 competitors from 204 nations in 2012, eighteen countries have hosted the Summer Olympics. The United States has hosted four Summer Olympics, more than any other nation, four cities have hosted two Summer Olympics, Athens, Paris, Los Angeles, and Tokyo. Tokyo is the first city outside of the Western world to host the Summer Olympics multiple times, asia has hosted the Summer Olympics four times in Japan, South Korea, and China. The only Summer Olympics held in the Southern Hemisphere have been in Australia, the 2016 Games are the first Summer Olympics to be held in South America and the first to be held during the local winter season. Africa has yet to host a Summer Olympics, only five countries—Greece, Australia, France, Great Britain, and Switzerland—have been represented at every Summer Olympic Games. The only country to have won at least one medal at every Summer Olympic Games is Great Britain. The United States leads the medal table. Qualification rules for each of the Olympic sports are set by the International Sports Federations that governs that sports international competition, for individual sports, competitors typically qualify through attaining a certain place in a major international event or on the IFs ranking list. There is a rule that maximum three individual athletes may represent each nation per competition. Nations most often qualify teams for team sports through continental qualifying tournaments, each nation may be represented by no more than one team per competition a team is two people in some sports. The United States has hosted four Summer Olympic Games, more than any other nation, the United Kingdom hosted the 2012 Olympic Games, its third Summer Olympic Games, in its capital London, making London the first city to host the Summer Olympic Games three times. Australia, France, Germany, Greece, and Japan have all hosted the Summer Olympic Games twice. Other countries that have hosted the Summer Olympics are Belgium, Brazil, China, Canada, Finland, Italy, Mexico, Netherlands, South Korea, Spain, the Soviet Union, asia has hosted the Summer Olympics three times and will host again in 2020. In 2016, Rio de Janeiro hosted the first Summer Olympics in South America, three cities have hosted two Summer Olympic Games, Los Angeles, Paris, and Athens. Stockholm has hosted events at two Summer Olympic Games, having hosted the games in 1912 and the events at the 1956 Summer Olympics—which they are usually listed as jointly hosting

9.
100 metres at the Olympics
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The 100 metres at the Summer Olympics has been contested since the first edition of the multi-sport event. The mens 100 m has been present on the Olympic athletics programme since 1896, the 100 metres is considered one of the blue ribbon events of the Olympics and is among the highest profile competitions at the games. The first Olympic champions were both Americans, Thomas Burke in the category and,32 years later, Betty Robinson in the womens category. The Olympic records for the event are 9.63 seconds, set by Bolt in 2012, the world records for the event have been equalled or broken during the Olympics on seven occasions in the mens category and on twelve occasions in the womens. Among the competing nations, the United States has had the most success in this event, having won sixteen golds in the mens race, Usain Bolt of Jamaica has won three consecutive titles. Four other athletes have won titles, Wyomia Tyus, Carl Lewis, Gail Devers. Merlene Ottey is the athlete to win three medals without winning gold, with one silver and two bronze medals. Many athletes that compete in this event also compete individually in the Olympic 200 metres, four of these men were also members of the winning team in the 4x100 meters relay at the same games - Jesse Owens, Bobby Morrow, Carl Lewis, and Usain Bolt. Two of these men have won a gold medal at the same games - Archie Hahn in the now defunct 60 metres. Four of these women were members of the winning team in the 4x100 meters relay at the same games - Fanny Blankers-Koen, Betty Cuthbert, Wilma Rudolph. Fanny Blankers-Koen is the one of these women to win four gold medals at the same games by winning the 80 metres hurdles in 1948. Marion Jones was the 2000 womens Olympic 100 m gold medallist but had her results annulled after admitting to using performance-enhancing drugs during her Olympic victory and these controversies have affected public perceptions of drug usage among sprint athletes, as well as track and field and the Olympics in general. The Olympic 100 metres competitions are carried out under standard international rules, the races are segregated by gender, with one for men and one for women. Traditionally there are four rounds of competition, heats, quarter-finals, semi-finals, prior to 1964, finals featured six athletes. For all Olympic competitions from 1964 onwards—allowing for a sufficient number of athletes being present—each race features eight runners, athletes are seeded by past performance to ensure an even balance of quality across the heats and allow the best runners to progress to the later stages. Usually in the first two rounds the top three runners progress to the next stage, a small number of other athletes also progress as the fastest non-qualifiers through a repechage system. Prior to 2012, the semi-finals stage comprised two races of eight athletes and the top four finishers in each race were entered into the final, several amendments were made to the competition format in 2012. Any participant not in possession of an Olympic qualifying standard time is entered into the preliminary round, qualifiers in this round progress to the first round proper

10.
2011 World Championships in Athletics
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The 13th IAAF World Championships in Athletics was an international athletics competition that was held in Daegu, South Korea. It started on 27 August 2011 and finished on 4 September 2011, the United States topped the medal standings in the competition with 25. During the competition,41 national records,4 area records,3 championship records, on 4 April 2006, the IAAF announced that nine countries had submitted expressions of interest for hosting the 2011 World Championships. When the seeking deadline passed on 1 December 2006, four cities had confirmed their candidatures. Gothenburg backed out later that month, citing lack of support from the Swedish government. Brisbane was announced as the Australian candidate with the Queensland Sport, the stadium previously hosted the 1982 Commonwealth Games and 2001 Goodwill Games. Brisbane also had a bid for the 2009 World Championships in Athletics. Daegu was the city chosen for the Korean bid, following on from an application to host the 2009 edition. Daegu had previously hosted the 2003 Summer Universiade and three matches of the 2002 FIFA World Cup, the World Championships in Athletics had never been staged in mainland Asia, although it has taken place twice in Japan. The Russian bid had Moscows Luzhniki Stadium as the proposed venue, the city hosted the 1980 Summer Olympics and the 2006 IAAF World Indoor Championships. Among the intent candidates were Casablanca and Split, both of which were failed bidders for the 2009 World Championships in Athletics, the Spanish candidate was rumored to be either Madrid or Valencia, but Spain eventually settled for Barcelona as a candidate for the 2013 World Championships in Athletics. The United States intent candidate city matched those bidding for the 2016 Summer Olympic Games, Chicago, the IAAF announced Daegu as the winning candidate at the IAAF Council Meeting in Mombasa on 27 March 2007. Its victory was based on the quality of the stadiums and the need for good crowds, iAAFs officials also praised Daegus ambition and challenging spirit as key to its winning bid. Both Moscow and Brisbane later confirmed their candidacy to host the 2013 World Championships in Athletics – a selection process won by the Russian capital, the events in the mens section ended with a world record in 4 x 100 metres relay set by Jamaica and several worlds leading results. Jamaica dominated the events, while Kenya and Ethiopia dominated the longer track events. In the field events, the United States and Germany were most successful, winning four, Yohan Blake and Usain Bolt, both from Jamaica, won two gold medals, being the most successful athletes in the mens events. In the 100 m final the largely favored Usain Bolt was disqualified for a false start, in the 200 m Bolt won with a time of 19.40 s, which was the fastest time ever not to be a world record at that point. Blake and Bolt, along with countrymen Nesta Carter and Michael Frater, ran in the 4 x 100 metres relay, in the 10,000 metres event, World Champion Kenenisa Bekele did not finish the race